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#21 | |
Member
Diego Villa
Join Date: Mar 2010
Location: Genova Italy
Posts: 37
Rep Power: 16 ![]() |
Quote:
The disturbs found by you are due to the velocity flux (seen as a surface vector field) computed in the two zones (within the MRF and out of it). From a mathematical point of view, it assumes different values inside and outside the MRF region. These values are coincident only if the cell's surface (seen as an interface) has a normal vector orthogonal to the imposed motion (in your case, it should be cylindrical). Otherwise, the phi value and the velocity field are not consistent seen from inside and outside the MRF zone. I hope to have clarified the problem, Diego |
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#22 | |
Member
Diego Villa
Join Date: Mar 2010
Location: Genova Italy
Posts: 37
Rep Power: 16 ![]() |
Quote:
The disturbs found by you are due to the velocity flux (seen as a surface vector field) computed in the two zones (within the MRF and out of it). From a mathematical point of view, it assumes different values inside and outside the MRF region. These values are coincident only if the cell's surface (seen as an interface) has a normal vector orthogonal to the imposed motion (in your case, it should be cylindrical). Otherwise, the phi value and the velocity field are not consistent seen from inside and outside the MRF zone. I hope to have clarified the problem, Diego |
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#23 | |
Member
Pedro Gouveia
Join Date: Oct 2022
Location: Portugal
Posts: 64
Rep Power: 3 ![]() |
Quote:
Thanks, it was clarified completely. By using a cylindrical mesh we grant a relative "orthogonality" between the cells immediately before and after the MRF interface. However, does a regual mesh mean worse results than the cylindrical one? |
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#24 | |
Member
Diego Villa
Join Date: Mar 2010
Location: Genova Italy
Posts: 37
Rep Power: 16 ![]() |
Quote:
Anyway, if the orthogonally is not too high, the solution converges properly. |
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Tags |
equation, mrf, theory |
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